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I wonder if the image of the Charnley house stair spindles (scroll down to the last 3 or 4 pics):
http://www.peterbeers.net/interests/flw ... _house.htm
..led Wright to take the next step and translate the wood to steel, and then naturally, he would be inclined to use the steel in tension...and then....
That, of course, is a good question, but I think you meant Albert not Warren. Warren Sr. was the father and client of Wright. McArthur House (1892) 4852 South Kenwood Avenue in Chicago, Illinois. Warren Jr. was a brother.
Albert Chase McArthur (February 2, 1881 â€“ March 1951) worked with architect Frank Lloyd Wright between 1907 and 1909. This practice was a remarkable collection of creative architectural designers. As his son, John Lloyd Wright, says,
â€œWilliam Drummond, Francis Barry Byrne, Walter Burley Griffin, Albert McArthur, Marion Mahony, Isabel Roberts and George Willis were the draftsmen. Five men, two women. They wore flowing ties, and smocks suitable to the realm. The men wore their hair like Papa, all except Albert, he didnâ€™t have enough hair... I know that each one of them was then making valuable contributions to the pioneering of the modern American architecture for which my father gets the full glory, headaches and recognition today!â€� 
Albert McArthur continued his education in Austria and Italy, opening an architectural firm in Chicago with partner Arthur S. Coffin in 1912. He moved his practice to Phoenix in 1925. The Biltmore is his most important design. In the course of the Great Depression, all three of the McArthur brothers moved to Hollywood, California in 1932. Albert Chase McArthur died in March 1951 in California.
Q: Did Albert Chase McArthur ever design anything else?
A: There are other works by Albert Chase McArthur in the Phoenix area including a residence for M. D. B. Morgan, completed in 1927, and several houses in the Phoenix Country Club area.
Of course then there is Wright's letter to Albert Chase McArthurâ€™s widow, twenty-five years after the Arizona Biltmoreâ€™s completion: "I have always given Albert's name as architect ... and always will. But I know better and so should you."
 â€œMy Fatherâ€�, John Lloyd Wright, 1995
 Arizona State University Library, special collections biography